This digital image is in the public domain and is free of known restrictions under copyright law, including all related and neighboring rights. You may copy, modify, or distribute this image for any commercial or non-commercial purpose without prior permission. It is requested that if distributing this image, credit be given to the Pennsylvania Geological Survey and any modifications made to the original image are noted.

Sponsorship

This Digital Object is provided in a collection that is included in POWER Library: Pennsylvania Photos and Documents, which is funded by the Office of Commonwealth Libraries of Pennsylvania/Pennsylvania Department of Education.